exam Maths Puzzle Numerical Ability

Can you help me with this equation?

An executive in an engineering firm earns a monthly salary plus a Christmas bonus of $8,700. If she earns a total of $97,000 per year, what is her monthly salary?

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exam Other Question

This is an extra credit question for my Honors Geometry Class-- I am in 8th grade

If a coin is flipped 4 times, find P (exactly 3 heads).

I do not know what my teacher is looking for- PLEASE HELP

THIS IS NOT A TEXTBOOK QUESTION! Use product rule to multiply.

sqrt (72) * sqrt (2)

My solution was to multiply sqrt (72) *sqrt (2) = sqrt 144 which is simplified to 12. Not sure if it should be simplified to 144 or 12.

Thanks!